Truck grill unit



FIG. 1 is a side elevation view of a truck grill unit showing our newdesign, it being understood that the opposite side is a mirror imagethereof and that the broken lines are for illustrative purposes only andform part of the claimed design;

FIG. 2 is an enlarged front elevation view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a greatly enlarged front elevation view thereof;

FIG. 5 is a side elevation view of FIG. 4; and

FIG. 6 is a top plan view of FIG. 4.

The ornamental design for a truck grill unit, as shown and described.